others-mainstream.lua

--#### [function]
 function say(text)
 print(text);
 return true;
end
--### [function]

--### [anonFunction]
say = function (text) print(text); return true; end
--### [anonFunction]

--### [ifElse]
if true then
  say("it is true");
else
  say("it is not true");
end
--### [ifElse]

--### [loops]
for i = 1,5 do
  say(i);
end

-- execute once, stop when true
repeat
 say("this is executed once");
until true

-- execute only if true
while true do
  say("this is an infinite loop");
end
--### [loops]

--### [short]
x = true and say("it is true") or say("it is not true")
-- the `x =` is required since lua distinguishes between statements and expressions
--### [short]

--### [recursion]
function while_loop ()
 say("yes");
 return true and while_loop();
end

function for_loop (i)
 i = i+1;
 say(i);
 return (i == 5) or for_loop(i);
end

for_loop(0)   -- <1>
while_loop()  -- <2>
-- (1) execute for-loop first
-- (2) since the while-loop will enter an infinite loop,
--     you will need to cancel the execution by pressing CTRL-C
--### [recursion]

-- == Functional constructs

-- lua doesn't implement map, reduce, filter by default